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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10825503c4a175fc9182df20a0b0810e3f12fe2702c7ec759c9485c187efc07' 
  AND token = 'bJtELdoCelZX8neQIjYnid4iIH9Y7PTMwxGeHMQNwT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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