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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40ba0c01d414b6c6d5839a534a82bc24e58d99cd72726b3f17ba8b6539d83ab' 
  AND token = '+dysy+vW9MeS2TzmvXDkHEkFHc4c+ysHC2J/ef0uHvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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