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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995c08141351e7bf05076a85f8b552db993839de135acc93c4ad607f19094c6a' 
  AND token = '514C4dlUAjgY1tUaQH7uBIvIs8qLLQnS7Blv8Aap3AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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