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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760e15b8072ca6fc5d565bcc8f359d8378085e927788214a89d83543d71d10ca' 
  AND token = 'yF/nz50LXiLJrECihmGHaNLb0HcYhz7DIbFKE9NUdiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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