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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860e7fb05c5855fa7250e002212fe90239adeb9cce83171abc5d9d427b2b94a5' 
  AND token = '6Wy+lXTmFy4ILOeO6oiSJLI/fga7tmCCi3zRC5N/VPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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