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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df2ad783a7a91a819b80497ccb80cf3c5ada7ca957dd3e8173cf55a733fe47f' 
  AND token = 'Yr50/SjgbHIHVG1CtnoZEsSTJSprHSQK0f1zOYAuhB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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