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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d07c2b8960340341dd69e53ff70932c41ce90b00009fab30e462f4a5db74b23' 
  AND token = 'e89w0cmSM8Y03yslXeYylsXreQrOQw7EzIrwVwhG8nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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