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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908f08cf50f83288186a76e8a67cf10703564e49ae424605bb12633d1bd78f6e' 
  AND token = 'c6woWLK5qKFxVcGaC6IAtnfqTVS6k44F3IaOL22ofhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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