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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94163f5e298e474d5a1199abcb323cbff76a3d7c20be0de8feda0358b60f1598' 
  AND token = 'G+E7AtbgduG1vpvE2YFsTpodvj8Eh7/a7XNDlMN+Gos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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