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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914fa9121f9c2c008d0a53da95b961d995262185dcb98ca034ebbbfc1c20da1a' 
  AND token = '9xd3dV0q18YnQSxp4SKH63Md/Vk3hyJ0K5ARylae0ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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