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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21959bd1b3de883821dfe06c30fb9c7ba4eebb0f960ba1e71d24b9fb905d3def' 
  AND token = 'wVUgaH3ErJFQ9PRvg1kw8xzEVGjb+czDt7IPMpTdEqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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