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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119cd5dc1c472d2b18316d90b08c4c9544550f558a22158742e485b7a6211789' 
  AND token = '7Xz4EvUtGf/C0J0XMCqqKS3YYlXy7e4YUerhOjC5ADM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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