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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bdb7b519ac62ab0914d0863050087080e06ad99337aa6663da0765e63dc72d' 
  AND token = 'mZVgbpGFrAkFn99Qez6KCAAaKuvl03h/0O1zAWE8Ntw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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