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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a44c38e08d982565d459a9c0b151a379be13ea67087fdb37d2b202557428e09' 
  AND token = 'NqgLRxuRcfIWPa5dxZG+H76Xhx7KoHge0HGUCBL7o8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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