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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97115b76e77e7126a04752803d44ec3d4bded67e3b395aeae9786b71f910eeb7' 
  AND token = 'XN+qTnp2MXEm08YEczKFGyw377It9Tw1A1vvQ6WW/ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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