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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f01017b5616a716a2c5732b5612972536b621e32ffa03a25356f6cfe5d6b2d0' 
  AND token = 'OV7NtwM/OZqzbmvTfJX5DgubQOEgRbe9LWymWlplI8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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