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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db412f33bb908cec96069a873326738ef13949b1a1bb6d24179ad1e7a997770e' 
  AND token = 'gNSnGtS5vd553sMemyWgVqYHprV9OLstAr6IvOhYQ8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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