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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56729591e6cd83ed71fcf708ff3a804f71dd7d4fcc8ebce8571bab40509dd60b' 
  AND token = '7hpvl3efLY3qo2e5+rNq8tMvT/5cXQclTsW85O9EnEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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