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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5c48a0557888ba3fb1192311bf637a6946cae5981700ea47da8939701a54b6' 
  AND token = 'd8Vsz9j5ynfa0WasUHAfvSd1p94FJ65S/ncZCFV6Szs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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