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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9bdb7c1a7cbd86d5d3e48c1b9757e10e89b263a6500446bc3952b1a9b3b675' 
  AND token = 'X6kReMEL89XSAJUXlso6K8ETkGUHFiCnWAW5njPuHPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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