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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3370a69c9f4796b39d9e60634f284f6590d42016ec675fc57f6d6e9599933ddb' 
  AND token = 'aTz+r2tW15OAEcOJQVEUippLsdDf8PMe8jD1099GXY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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