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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad00067d425b605394a5da5124ea0a1d189a9676dc53d761b826727cc7cc764' 
  AND token = 'Zxb4xfAnGOcu7IFKsb7DlAqCnt9Lg3QNu5R5gnTod2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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