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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa064b3514debf2fbdebfbcdb56596f1f1a26c0dd53377e015739382647916dd' 
  AND token = 'YgxeSTnT8ffU85EDkmi9QpjdI2s51gSEtSUZFurkKGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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