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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946d41a86e569e1e05b72cec609821a35e11ae4a1921d708b9ca2b032bd3b59d' 
  AND token = 'vZvqFjNAEeMwbqExP/iQ4jxwDuTJdoplZ4Tp2RtXBIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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