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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a9bb271c48c84220d1d282f13cea0729883d8c6bbf57a41ae12a538428b026' 
  AND token = '/2IZ3qmT6/MDBWgBH8jPCgIxGsQcs8eOR9DS78Q0nRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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