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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0da6c402d33d11172dc445049c412082f8551c1597a8c24bcdc4b08635331a6' 
  AND token = 'lWvIClB9lDr+Xu6FrYFeriu7Oe6inKwMF6wACqbuqHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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