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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09e7fd19fc7757d316c727a2e93a26a2de542dad030e7628c85831bb85b4805' 
  AND token = '2E1JJd+II7PmwpX7cA7JOWGtkLKC7cwFUKPKTSBPmV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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