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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8828c37a1e6fdabbaf9a666d398f0400476bec88923682d5aeaad89de0851ae1' 
  AND token = '8bCiy69Ax1hHubxEmnfXn/jxU5fBBSYHfvNKYbcuq5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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