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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d822d5bd278d44bbcf551c7255f70e861f318921d0327042a108178ef75c474' 
  AND token = '4NeIpK9x3sn3Pnl9WTT0cOy07ce0GX51+g43b/A/rFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}