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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823b93c57f4579d8d009c4423701f8436452896c9bcb13e8aece734e6c39980c' 
  AND token = '6DyLLnEN9W/dfPTN+P4E4tZRkVs5ftcxbZQVqB569LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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