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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6758ad37d652bd10dae28576e2a6f6baddcc9de7b5da4dab555a93d240d828db' 
  AND token = 'IofH6aQZkb6H9DcOFdByC7hF60NxIoHHe+HeTJ1A3eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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