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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062079436ac121d3021662bb9d54f7f680b776ff4799e6c2ee22b69e7192ae09' 
  AND token = 'AMK7zX7S8lvqQQNeXN5Fc2cxOi4/z8Mdw2oSSA5bToM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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