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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b7dd2890f37ef7d146fc1050c5c69bf6496bee5d190381dd9e9aa630259c2f' 
  AND token = 'SrbKPEy60j7iPZ5CBcwuednreBBWTRch2IXPVTdSaHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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