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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7571963a8b0e7994bf01a214c69eb54aba02d148b88f8db159188b4d589a63c2' 
  AND token = 'HDTU73lsx4gYa66reFCMgn+/0K+ocKw5tWLBs65k2W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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