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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9cc1495c9004bb11f08846d320a3e07f0f7f08557387d8d15d8e1e3081b710' 
  AND token = 'G/m+nmc1iVspibCyTT5eWbaWCjnOhqknL1XjeRVQQzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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