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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2efd5cca1d316040d1f6799b5709ea5ac0c2eac8bc344d29269d7f2356b62f8' 
  AND token = 'faisYf+L4NdqcuhQkteAY2y2Qbo34Q7RxknSYBbNrf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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