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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f768b687ac3793541acda89fea53423aaf0c90adf506baff2fbcec3b4422346f' 
  AND token = 'rH6OARewWvKj4bAoRTQko1qoNJSb50/6rlalhPMBv14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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