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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a146f4b540a65d5615204587708dab16b899c96ab0e93a0bb1cabf3479a930' 
  AND token = 'GVFMh7Zz8VStLUGHHeLw9P1NEXx+7g25LAOClbE69N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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