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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c695b336b7a2ce33f9d44b477b752b67f0bf326a0f49be7fc3ba1b1354d599c' 
  AND token = 'KoaltUnnCz49+B5jx6Xwq1Tb5EQ8n+iebRYTML9o9Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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