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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca7688ce250f891049db15d776297f43ee39827a0905d67e6f37c6f3caa338b' 
  AND token = 'J0vaITYSmle6g4sWQIeTGIT/0k9TVI+978w+q6VmqXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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