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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa5de30a03d19233b15f10bf9c7a250b60b21f7cef2818e739e3e3b34347c08' 
  AND token = 'icz70xFFgGPXQZ00FFNELxb5kbFVxoocoJwgZO8C8vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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