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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68723e14115987013f1313b2ccecb313836a7f2e62033268f3d3b21c70b859a4' 
  AND token = 'AHa4DgLPJs3ZimUyVolUszpHjV8cofUBe2st1EgbJ5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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