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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2a98b7bdb0388cddaae3b80d8f4b97e53c896456e730bee7e99c9b1763c4ae' 
  AND token = '+gEn3ARrnEpo+x0w40Al7pIq5mLa3Cvhq5Fbn2KyMTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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