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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00b83e14496a788a00ed3600e31e0c8f3258592383b13e621e09513cfbe5af8' 
  AND token = 'XdiKoKE5Zc4HaPyLKDomJEoClB7vkSEnO12Dz1o7xaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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