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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b8ef26dbe4921a37263507b31e2c54e49a36883748022223bf333bc8b0c15b' 
  AND token = 'cdMqkCphstS7RFcN4VMn600nXyQYnEh75mVr+sxwrS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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