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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd14d4281ab7aaf91820365856fc7a4d6656b3856d7af8351c644b230e65acf4' 
  AND token = '70EPWJUPJR6fAaivTRCQaBSgFqB53Pftz0NyJ2XkOyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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