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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91681b40e7f8772f3c2a7522d5084d5b6300824ddb2ab298fa5d3a75e6d6ab0' 
  AND token = 'HsjfnMrjrMetWE//MjpOJ/9C/h2Rpglx8aHUfAwrWsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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