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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d85df5a5e85722ce2d75de56c5fbc56db90f197bfc90d7abb33d9f44ca9749' 
  AND token = 'ub31/kaHpCtiM/tamPW+kjYNp6glmsynQTJsK2Ng74M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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