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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbfa3107a8e18f678161c22c6c95b6b97e02a499f97cbf9f4fbcf75f20db148' 
  AND token = 'phwomtOFWu1nlisS+2hUODroF6rFQRFW+NCQ+L1euUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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