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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d27de0e14201ef37d16b867d05eba4c3abc95ec4d0a62853d9e48e237839c7' 
  AND token = '0n38JyOp0cl4IYUNlC7XHHQe/t6pH62n7cnuE9UIBqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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