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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca675bdb486daea7180b41283190b55697d3de87366d0270b5d817cbaeb4310' 
  AND token = '8He90CTO8jWGxpgXr8K2qqHyuQzLCEokellr5nuSU7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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