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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c20b3c065955df01e6b5869ca820f07098ced440cb9158cfc58c4486b508b04' 
  AND token = 'a5HmL51uNJhFG3UtK36mtRIiSOv8lxeSI3CcumjvwDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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