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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe03682a9386e85fe3f8342aef80239ed4d31b69865fed1f04d9c4761ee13cc9' 
  AND token = '9Qkm75WgTUF/31P5XP6/rGYV6ylqCAxuIY8j2+80B4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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