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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a829250ed8beb6314a5c8d4c69ffac2b4f34ce11436952b285af1e46a220262e' 
  AND token = '8Lu6sG7XIihWr3SO/3emIi7e2hizzf3DYi3WN4DJe5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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