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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914d452df6ef2ebc4e3fc3d3893b6cba41aca1898a42b45cb749f257d7baedd1' 
  AND token = 'n88agqwPWGjTWbEByQGU4MMRoQxxxc5meEd/gqleR28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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