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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3d5a2d048d42feaa4000c7bd2b43608e69c8497edb847c8657c685b6e6be17' 
  AND token = 'aori0DqyNbbwofP2Y25arVSKfIGsMZkdfb9d/AFIQio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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