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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9a8cdd72680227bc4f7d84c6bfe9f57d26a7d4d639bc5b8fe7aa9f0a447c92' 
  AND token = 'cmwVTLVMW8CAvswy6UY/PkTvAFrsGbR+Mh0UfKq5oD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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