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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b917e4f9b4ad94ac138aa892416e0fd8dd5ae9882f1e89a08488f97c8a75c1' 
  AND token = 'ydbxPX1k8UWoqFZmlWIFcJlu1u9d5vJuoYi/GZzMmqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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