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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9de5427ce8352879593cf575d054024dd5beeafac54b40b55754fd28daf595' 
  AND token = 'Q8n+3C425M5n1KQrHY7HElcduOKtb4IBgOD+r3+1/8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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