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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0144e932e55de8b0c8d5f80091b7b28918a33011328eff0ea4a5385ac881ac' 
  AND token = 'mQOW+N9SGSotP/TQcS3E84TTuCenwPGUAnndy9VMQDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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