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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e56ba6c8d988138ff83d87a052773ca3f77c801a19cb25d54d7d79014cb430' 
  AND token = 'QRpSE5aJlZx4qJ8DhI5h9C9MRFq8AmEg/NEaibG89Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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